Presentation on theme: "LAND PLANTS AND THEIR EVOLUTION Chapter 19 Characteristics of Plants Multicellular autotrophs Cell wall of cellulose Food stored as starch Evolved."— Presentation transcript:
LAND PLANTS AND THEIR EVOLUTION Chapter 19 Characteristics of Plants Multicellular autotrophs Cell wall of cellulose Food stored as starch Evolved from green algae Primarily terrestrial
PROBLEMS OF LIFE ON LAND PROBLEMSOLUTION Obtain water Roots and root hairs Transport water, food Xylemphloem Prevent dessication Cutin, drop leaves, stomates Gravity Cell walls, lignin, xylem Obtain CO2 Stomates ReproducePollen—sperm Protect Embryo Seeds, Fruit
Plant Kingdom Non VascularVascular Bryophytes Tracheophytes MossesLiverworts
BRYOPHYTES Mosses and Liverworts Mosses and Liverworts 1.No vascular tissue (xylem and phloem) 2.No true roots, stems, flowers or leaves 3.Tiny! 4.Water is required for fertilization 5.Gametophyte generation is dominant.
MOSS ANATOMY Antheridium: Reproductive structure that makes sperm Archegonium: Reproductive structure that makes eggs Protonema: A filament that grows into a new plant
ALTERNATION OF GENERATIONS GAMETOPHYTE: plant generation that produces gametes SPOROPHYTE: Plant generation that produces spores
Plant Life Cycle ALTERNATION OF GENERATIONS 2Nn Diploidhaploid